<template>
  <main id="search-page" class="DocSearch">

    <p v-if="!isAlgoliaConfigured">
      This search page is not available at the moment, please use the search box in the top navigation bar.
    </p>

    <template v-else>

      <form role="search" class="DocSearch-Form" @submit="visitFirstResult">

        <label class="DocSearch-MagnifierLabel" for="docsearch-input" id="docsearch-label">
          <svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20">
            <path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path>
          </svg>
        </label>

        <input class="DocSearch-Input" id="docsearch-input" v-model="search" :placeholder="searchPlaceholder">

      </form>

      <div class="search-footer">

        <p>
          <template v-if="totalResults">
            <strong>{{ totalResults }} results</strong> found in {{ queryTime }}ms
          </template>
        </p>

        <div class="DocSearch-Logo">
          <a href="https://www.algolia.com/docsearch" target="_blank" rel="noopener noreferrer">
            <span class="DocSearch-Label">Search by</span>
            <svg width="77" height="19">
              <path d="M2.5067 0h14.0245c1.384.001 2.5058 1.1205 2.5068 2.5017V16.5c-.0014 1.3808-1.1232 2.4995-2.5068 2.5H2.5067C1.1232 18.9995.0014 17.8808 0 16.5V2.4958A2.495 2.495 0 01.735.7294 2.505 2.505 0 012.5068 0zM37.95 15.0695c-3.7068.0168-3.7068-2.986-3.7068-3.4634L34.2372.3576 36.498 0v11.1794c0 .2715 0 1.9889 1.452 1.994v1.8961zm-9.1666-1.8388c.694 0 1.2086-.0397 1.5678-.1088v-2.2934a5.3639 5.3639 0 00-1.3303-.1679 4.8283 4.8283 0 00-.758.0582 2.2845 2.2845 0 00-.688.2024c-.2029.0979-.371.2362-.4919.4142-.1268.1788-.185.2826-.185.5533 0 .5297.185.8359.5205 1.0375.3355.2016.7928.3053 1.365.3053v-.0008zm-.1969-8.1817c.7463 0 1.3768.092 1.8856.2767.5088.1838.9195.4428 1.2204.7717.3068.334.5147.7777.6423 1.251.1327.4723.196.991.196 1.5603v5.798c-.5235.1036-1.05.192-1.5787.2649-.7048.1037-1.4976.156-2.3774.156-.5832 0-1.1215-.0582-1.6016-.167a3.385 3.385 0 01-1.2432-.5364 2.6034 2.6034 0 01-.8037-.9565c-.191-.3922-.29-.9447-.29-1.5208 0-.5533.11-.905.3246-1.2863a2.7351 2.7351 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            </svg>
          </a>
        </div>

      </div>

      <template v-if="results.length">

        <div v-for="(result, i) in results" :key="i" class="search-result">
          <a class="title" :href="result.url" v-html="result.title" />
          <p v-if="result.summary" class="summary" v-html="result.summary" />
          <div class="breadcrumbs">
            <span v-for="(breadcrumb, j) in result.breadcrumbs" :key="j" class="breadcrumb" v-html="breadcrumb" />
          </div>
        </div>

      </template>

      <p v-else-if="search">No results found for query "<span v-text="search" />".</p>

      <div ref="infiniteScrollAnchor"></div>

    </template>

  </main>
</template>

<script>
export default {

  data () {
    return {
      algoliaIndex: undefined,
      infiniteScrollObserver: undefined,
      searchPlaceholder: undefined,
      search: '',
      results: [],
      totalResults: 0,
      totalPages: 0,
      lastPage: 0,
      queryTime: 0
    }
  },

  computed: {
    algoliaOptions () {
      return this.$themeConfig.algolia || {}
    },

    isAlgoliaConfigured () {
      return this.algoliaOptions && this.algoliaOptions.apiKey && this.algoliaOptions.indexName
    }
  },

  watch: {
    $lang (newValue) {
      this.initializeAlgoliaIndex(this.algoliaOptions, newValue)
    },

    algoliaOptions (newValue) {
      this.initializeAlgoliaIndex(newValue, this.$lang)
    },

    search () {
      this.refreshSearchResults()

      window.history.pushState(
        {},
        'Vue.js Search',
        window.location.origin + window.location.pathname + '?q=' + encodeURIComponent(this.search)
      )
    }
  },

  mounted () {
    this.search = (new URL(location)).searchParams.get('q') || '';

    if (!this.isAlgoliaConfigured)
      return;

    this.searchPlaceholder = this.$themeConfig.searchPlaceholder || 'Search Vue.js'
    this.initializeAlgoliaIndex(this.algoliaOptions, this.$lang)
    this.initializeInfiniteScrollObserver()
  },

  destroyed () {
    if (!this.infiniteScrollObserver)
      return;

    this.infiniteScrollObserver.disconnect()
  },

  methods: {
    async initializeAlgoliaIndex (userOptions, lang) {
      const { default: algoliasearch } = await import(/* webpackChunkName: "search-page" */ 'algoliasearch')
      const client = algoliasearch(this.algoliaOptions.appId, this.algoliaOptions.apiKey);

      this.algoliaIndex = client.initIndex(this.algoliaOptions.indexName);

      this.refreshSearchResults()
    },

    async initializeInfiniteScrollObserver() {
      await import(/* webpackChunkName: "search-page" */ 'intersection-observer')

      this.infiniteScrollObserver = new IntersectionObserver(([{ isIntersecting }]) => {
        if (!isIntersecting || this.totalResults === 0 || this.totalPages === this.lastPage + 1)
          return

        this.lastPage++
        this.updateSearchResults()
      })

      this.infiniteScrollObserver.observe(this.$refs.infiniteScrollAnchor)
    },

    async updateSearchResults() {
      if (!this.search || !this.algoliaIndex)
        return

      const response = await this.algoliaIndex.search(this.search, { page: this.lastPage })

      this.results.push(...response.hits.map(hit => this.parseSearchHit(hit)))
      this.totalResults = response.nbHits
      this.totalPages = response.nbPages
      this.queryTime = response.processingTimeMS
    },

    refreshSearchResults() {
      this.results = []
      this.totalResults = 0
      this.totalPages = 0
      this.lastPage = 0
      this.queryTime = 0

      this.updateSearchResults()
    },

    visitFirstResult(e) {
      e.preventDefault()

      if (this.results.length === 0)
        return;

      window.location = this.results[0].url
    },

    parseSearchHit(hit) {
      const hierarchy = hit._highlightResult.hierarchy
      const titles = []

      let summary, levelName, level = 0
      while ((levelName = 'lvl' + level++) in hierarchy) {
        titles.push(hierarchy[levelName].value)
      }

      if (hit._snippetResult && hit._snippetResult.content) {
        summary = hit._snippetResult.content.value + '...'
      }

      return {
        title: titles.pop(),
        url: hit.url,
        summary: summary,
        breadcrumbs: titles,
      }
    }
  }
}
</script>

<style lang="scss">
@import "@theme/styles/_settings.scss";

#search-page {

  .search-footer {
    display: flex;
    height: 35px;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;

    p {
      margin: 0;
      padding: 0;
      font-size: .9rem;
    }

    .DocSearch-Logo a:hover {
      text-decoration: none;
    }

  }

  .search-result {
    margin-bottom: 15px;

    .title {
      display: block;
    }

    .summary {
      padding: 0;
      margin: 0;
      font-size: .9rem;
    }

    .breadcrumb {
      font-size: .9rem;
      color: $light;

      & + .breadcrumb::before {
        content: "\203A\A0";
        margin-left: 5px;
        color: $light;
      }

    }

  }

}
</style>
